Water-tube boiler.



No. 633,575. Patented Sept. 26, |899.

E. C. DE YARMETT 5. E. M. HAYNES.

WATER TUBE BolLE.

(Application led July 17, 1899.) (No Model.)

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IINlTED STATES PATENT OFFICE.

IDVARD'C. DE YARMETT AND EDWARD M. HAYNES, OF HAMPTON, VIRGINIA.

WATER-TUBE Bol'LER.

SPECIFICATION forming part of Letters Patent No. 633,575, dated September 26, 1899. Application ined July 17, 1899. serial No. 724,164. (No model ['0 @ZZ zU/"tom it may concern:

Be it known that we, EDWARD C. DE YAR- .llET'r and EDWARD M. HAYNEs, citizens of the United States, residing at Hampton, in the county of Elizabeth City, State of Virginia, have invented certain new and useful Improvements in Tater-Tube Boilers, of which the following is a specification.

This invention relates to improvements in water-tube boilers, and has for its object to provide a novel arrangement of tubes whereby the water is delivered to the steam-drum in a thoroughly-heated condition and an efficient and satisfactory circulation maintained. These objects are accomplished by a novel arrangement of tubes in a number of series crossing each other above the lire-grate, disposed so as to obtain the greatest possible heating of the water witllin a given space, and a novel arrangement of the tubes in each series by which those tubes which are the most exposed to the heat of the fire deliver into the upper portion of the steam-drum and those which are the least exposed to the lire heat leave the drum at its lower portion, whereby they serve the purpose of conducting the cooler water from the drum, and thus accomplish an efiicient and satisfactory circulation.

The invention has also for its object to otherwise improve in construction and arrangement boilers o-f the class to which it relates.

To these ends said invention consists in the novel arrangement and mode of operation of parts hereinafter described, and pointed out in the claims, reference being made to the accompanying drawings, in which- Figure l is a cross-sectional View of the boiler' and Fie'. 2 a side elevation ill whi-ch.

the casing-boiler is omitted and part of the feed-water-hcating pipes broken away.

In the said drawings the referenceullulneral 3 indicates the boiler-casing, having a stack 4t for conducting away the products of combustion. lVater or mud drums 5 are arranged longitudinally of the casing near the bottom cated a fire-grate 7, and above the latter and in the upper portioll of the casing the steamdrum 8 is located. p

Communicating at their lower ends with the water or lnud drums 5 and at their upper ends with the steam-drum are a number of series of water-tubes. 9 and 10, arranged longitudinally of the drum in series and which are approximately in the form of ogee curves, which admit of free expansion and contrac- `tion without injurious strain. The curves described by these tubes are easy, so that they are susceptible of being cleaned without difficulty.

The seriesof tubes cross each other above the lire-grate '7, those series which communicate with the water or mud drum 5 at the left of the casing crossing over and communicating with the steam-drum at the rigllthand side and those series which communicate with the right-hand water or lnud drum 5 crossing over and communicating with the steam-drum at the left-hand side thereof, so that they form a bridge or baffle over the tire, and this arrangement results in dellecting the flame and heat-waves of the fire, causing the same to pursue different paths, as indicated by the arrows in Fig. l of the drawings. It will be seen that the series of tubes 9 bafe and deflect the flame and heat-waves, conlpelling one portion to pass over the series of tubes l0, after which they pass over several of the longer tubes ct b c in the Vseries 9 abo-ve the place of crossing and imparting ceive the flames and lieat-waves a third time, y

whereby these tubes are more thoroughly heated than the others in the series. The shorter tubes d e and d e in each se1ies,\vhich are farthest from the fire and communicate With the lowermost portion of the steam-drum, it will be seen, are traversed by the dames and heat-Waves but once and below the point of crossing of the series 9 and l0, their upper Vportions being out of the lines or paths pursued by the heat because of the deflection of bathing hereinbefore referred to, and these tubes are manifestly heated toa considerably less degree than those with which the heat comes in contact a plurality of times. This arrangement is valuable, since it will be seen the longer tubes, Which are subjected to inuence of the heat most, discharge into the drum at greater elevations than the short tubes,which are exposed to the heat but once, and thus an efficient and satisfactory circulation is maintained, the hottest Water being discharged into the uppermost part of the steam-drum and the cooler waterin said drum being conveyed back to the Water or mud drums through the short tubes, which have a temperature very much less than the longer tubes,as above explained. It has been found that in those tubes which are subjected to the heat several times, as set forth, the Water is heated so intensely that steam is formed in the tubes during the course of the water toward the steam-drum, While in the shorter tubes, which are subjected to the heat but once, the cooler water from the steam-drum descends very satisfactorily to the Water or mud drums, thus maintaining a perfect circulation Without the necessity of auxiliary circulation-pipes.

By our invention We provide a water-tube boiler in which, by reason of the novel arrangement and formation of the tubes, the greatest amount of exposure of the heatingsurface of the pipes to the heat is obtained in a casing of given dimensions, and at the same time an efficient and satisfactory circulation is maintained by arranging those tubes in each series which communicate with the 10W- ermost portion of the steam-drum and conduct the cooler water therefrom so that they are subjected to the heat in lesser degree and have therefore a materiallyless temperature than those tubes which are arranged in the most intense heating-zone of the fire and are several times traversed by the heat,and which serve to thoroughly heat and deliver the Water to the drum at higher points thereof.

Having thus described the invention, that which is claimed as neuT isl. In a Water-tube boiler, the combination with water-drums, and a steam-drum, of a plurality of series of Water-tubes communieating with said Water-drums and with opposite sides of the steam-drum and crossing each other over the nre-grate to form a bridge, the shorter tubes of each series being arranged farthest from the more intense heat zone of the fire and leading from the lower portion of the steam-drum and the other tubes communicating with the upper portion of the steam-drum, substantially as described.

2. In a Water-tube boiler, the combination with Water-drums, a steam-drum, and a firegrate, of a plurality of series of Water-tubes communicating with said Water-drum and with opposite sides of the steam-drum, crossing each other over the fire-grate, and the shorter tubes thereof arranged farthest from the fire-grate and communicating with the lower portion of the steam-drum, and the other tubes communicating with the upper portion of the steam-drum, substantially as described.

3. In a Water-tube boiler, the combination with water-drums, a fire-grate, and a steamdrum, of Water-tubes communicating with said Water-drums and steam-drum and crossing each other over the tire, the tubes being arranged so that some of the tubes in. each series are subjected to the influence of the heat a plurality of times, and others of said tubes are subjected to the heat but a single time, substantially as described.

4. In a Water-tube boiler, the combination of water-drums arranged at opposite sides of the casing,feed-Water heaters communicating with said Water-drums and protecting and forming a Water-jacket for the side Walls of the casing, a fire-grate arranged between said Water-drums, a steam-drum located above said grate, and Water-tubes communicating with said Water-drums and steam-drum,cross ing each other above the fire-grate and communicating with the steam-drum at opposite sides thereof those pipes of each series which are most remote from the greatest heating zone of the fire leading from the lower portion of the steam-drum, and those which are arranged in the more intense heating-zone discharging into the higher points of the steam` drum, substantially as described.

5. In a Water-tube boiler, the combination of Water-drums arranged at opposite sides of the casing, a fire-grate arranged between said Water-drums, a steam-drum located above IOO IIO

said grate, and Water-tubes communicating with said Water-drums and steam-Gru nnerossing each other above the fire-grate and eomrnunieating with the steam-drum at opposite sides thereof those pipes of each series which are most remote from the greatest heat-ing zone of the fire leading -from the lower portion of the steam-drum, and those which are arranged in the more intense heating Zone discharging into the higher points of the Vsteam-drum, substantially as described.

In testimony whereof We have hereunto set our hands in presence of two subscribing` witnesses.

EDWARD C. DE YARMETT. EDVARD M. HAYNES. Witnesses to the signature of E. C. De Yarinett:

N. B. WooDALL,

E. L. DAVIS. Vitnesses to the signature of Edward M. Haynes:

S. M. VON SOHILLING, EUGENE IR'VIN. 

